Breadth vs. Depth: The Timing of Specialization in Higher Education

I wish to thank Claudia Goldin, Caroline Hoxby, and Larry Katz for extensive comments, as well as Nittai Bergman, Saar Golde, Jeff Grogger, Michael Kremer, Seema Jayachandran, Bob Lalonde, Steve Machin, Klaus Miescke, Derek Neal, Steve Pischke, Cristian Pop-Eleches, Sarah Reber, Bruce Sacerdote, Anna Vignoles, Abigail Waggoner, Tara Watson and seminar participants at Clemson University, Hebrew University, Harvard University, Michigan State University, Tel-Aviv University, UCSD, UC Riverside, University of Chicago, and the NBER Higher Education meeting for many helpful suggestions. I am grateful to the Universities Statistical Record, the UK Data Archive, and several university administrators in Scotland and England for assistance. All errors are my own. This work was supported by a grant from the Spencer Foundation. The views expressed herein are those of the author and do not necessarily reflect the views of the National Bureau of Economic Research.